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3 years ago

Gina made a poster for plastic recycling week and included this information on her poster:

Physics

2 answers:

Naya [18.7K]3 years ago

7 0

Answer:

Gina should put “rubber tires” under “Synthetic.”

Gina should put “starch” under “Natural.”

Explanation:

miskamm [114]3 years ago

4 0

Answer:

Gina should put “rubber tires” under “Synthetic.”

Gina should put “starch” under “Natural.”

Explanation: I just did the assignment ;P

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A speaker at an open-air concert emits 600 W of sound power, radiated equally in all directions.

Marina86 [1]

Answer

Given,

Sound Power, P = 600 W

a) Intensity of sound,

r = 5 m

we know,

$I = \dfrac{P}{A}$

$I = \dfrac{P}{4\pi r^2}$

$I = \dfrac{600}{4\pi\times 5^2}$

I = 1.91 W/m²

b) Sound intensity

$\beta = 10 log(\dfrac{I}{I_0})$

I₀ = 10⁻¹²

$\beta = 10 log(\dfrac{1.91}{10^{-12}})$

$\beta = 123\ dB$

c) Sound experienced by the Phil

β₁ = 123 - 23 = 100 \ dB

distance from the sound

again using sound intensity formula

$\beta = 10 log(\dfrac{I}{I_0})$

$100= 10 log(\dfrac{I}{10^{-12}})$

$I = 10^{-12}\times 10^{10}$

where, I = P/A

$\dfrac{P}{4\pi r^2} = 10^{-2}$

$r^2 = \dfrac{600}{0.04\times \pi}$

r = 69.09 m

Distance where Phil will experience same sound intensity without earplug is equal to r = 69.09 m

7 0

4 years ago

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration

miss Akunina [59]

Answer:

1728.42857143 m/s²

0.00155883061577 s

259.264285715 m/s²

0.0103922041051 s

The child will get injured if he/she falls on a hardwood floor

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

$v^2-u^2=2gs\\\Rightarrow v=\sqrt{2gs+u^2}\\\Rightarrow v=\sqrt{2\times 9.81\times 0.37+0^2}\\\Rightarrow v=2.69432737432\ m/s$

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{0^2-2.69432737432^2}{2\times 2.1\times 10^{-3}}\\\Rightarrow a=-1728.42857143\ m/s^2$

Magnitude of deceleration is 1728.42857143 m/s²

$v=u+at\\\Rightarrow t=\dfrac{v-u}{a}\\\Rightarrow t=\dfrac{0-2.69432737432}{-1728.42857143}\\\Rightarrow t=0.00155883061577\ s$

Time taken is 0.00155883061577 s

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{0^2-2.69432737432^2}{2\times 1.4\times 10^{-2}}\\\Rightarrow a=-259.264285715\ m/s^2$

Magnitude of deceleration is 259.264285715 m/s²

$v=u+at\\\Rightarrow t=\dfrac{v-u}{a}\\\Rightarrow t=\dfrac{0-2.69432737432}{-259.264285715}\\\Rightarrow t=0.0103922041051\ s$

Time taken is 0.0103922041051 s

It is likely that the child will get injured if he/she falls on a hardwood floor.

It is less likely that the child will get injured if he/she falls on a carpeted floor.

7 0

3 years ago

Use this table of a school bus during morning pickups to calculate its average speed between 0 h and 2.340 h.

Gelneren [198K]

The average speed between 0 h and 2.340 h is 6.97 Km/h

Average speed is defined as the total distance travelled divided by the total time taken to cover the distance.

$Average \: speed = \frac{total \: distance}{total \: time} \\ \\$

With the above formula, we can obtain the average speed between 0 h and 2.340 h as illustrated below:

Total time = 2.340 – 0 = 2.340 h
Total distance = 16.3 – 0 = 16.3 Km
Average speed =?

$Average \: speed = \frac{total \: distance}{total \: time} \\ \\Average \: speed = \frac{16.3}{2.340} \\ \\ Average \: speed = 6.97 \: Km/h \\ \\$

Learn more about average speed: brainly.com/question/24884027

8 0

2 years ago

Does Free Style Stroke have a 100 meter event? <br> Yes<br> No

fiasKO [112]

Very sad to hear from her

8 0

3 years ago

Read 2 more answers

Distinguish between directly proportional and inversely proportional with an example of each

RideAnS [48]

Consider two variables said to be "inversely proportional" to each other. If all other variables are held constant, the magnitude or absolute value of one inversely proportional variable decreases if the other variable increases, while their product (the constant of proportionality k) is always the same.

4 0

3 years ago